Category: Chemical Heat Transfer

A. Temperature of the heating surface is less than the boiling point of the liquid
B. Temperature of the heating surface is more than the boiling point of the liquid
C. Bubbles from heating surface are absorbed by the mass of the liquid
D. Very large vapour space is necessary

A. Economy of a multiple effect evaporator is not influenced by the boiling point elevation
B. Two identical cubes of iron and copper will have the same heat content under the same
conditions of temperature
C. Double pipe heat exchangers are mostly used in the field of refrigeration
D. Finned tube heat exchangers are suitable for heating air by steam

A. gD3.β.Δtρ2/μ2
B. gD2βΔtρ/μ2
C. gD2βΔtP2μ
D. gD3βΔtP2/μ

A. Low Reynold’s number
B. Very low Grashoff number
C. Molten metals
D. All A., B. and C.

A. Antoine
B. Kopp’s
C. Lee’s
D. Kistyakowsky

A. A section of the exchanger in which change in temperature of one stream equals the average
driving force in the section
B. The size of the exchanger in which heat transfer rate is 1 kcal/hr
C. Both A. and B.
D. None of these

A. 0
B. 0.5
C. 1
D. 5

A. Total
B. Monochromatic
C. Both A. & B.
D. Neither A. nor B.

A. Increase the steam economy & decrease the capacity
B. Increase the steam economy & the capacity
C. Decrease the steam economy & the capacity
D. Decrease the steam economy & increase the capacity

A. Open pan evaporation
B. Long tube vertical evaporator
C. Agitated film evaporator
D. None of these